'89 48spl low speed idle adj.

Beck · Dec 11, 2004

I checked my carbs for the low speed idle adj. On top of the carb there is a brass tube looking thing with a screw slot in the end. It is on an angle facing the starbord side is this the low speed idle adj.? Or is it inside the air intake chamber? I mean do you need to take the front cover of the air intake off to access the idle adjustments? With the cover off you can see what looks like an adjustment, what is that for? Gill009, You said you have a Haynes manual, I do not want any copies as I know they are copywrited, but If its not too much trouble just some type of order of things to check. This is what I have: *Both carbs perfectly in sync opening the same. *In netural, carb. roller slightly touched cam at the mark. This is what I need: *Order of things to check. *What is the distance between top swivals controling the timming? *Low speed timming, if it matters I mean perhaps with all other things adj. the low speed timming may just be set. *What is the low speed idle rpm? I think this is enough at this time. I plan to check wot timming as Joe Reeves has mentioned before I run it again and adjust 4 degrees less than what it calls for. Thanks in advance, Beck

I plan to order the oem manual if I keep this engine, I hope to upgrade in boats and keep this engine but would like to wind up with a 70-75 eventually.

Joe Reeves · Dec 12, 2004

Re: '89 48spl low speed idle adj.

Beck... If those screws that you mention on the starboard side of the carburetor have wound tension springs between them and the carburetor, then yes, those are the slow speed adjustable needle valves (That's what should be there). Adjust them as follows. (Carburetor Adjustment - Single S/S Adjustable Needle Valve) (J. Reeves) Initial setting is: Slow speed = seat gently, then open 1-1/2 turns. Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running. Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting. Note: As a final double check setting of the slow speed valve(s), if the engine has more than one carburetor, do not attempt to gradually adjust all of the valves/carburetors at the same time. Do one at a time until you hit the above response (die out or spit back), then go on to the next valve/carburetor. It may be necessary to back out "all" of the slow speed adjustable needle valves 1/8 turn before doing this final adjustment due to the fact that one of the valves might be initially set ever so slightly lean. When you have finished the above adjustment, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway. There are no other fuel/air adjustments on those carburetors. The brass jet that you see at the top front area of the carburetor is a Idle Air Bleed jet. The brass fixed high speed jet is located in the bottom center portion of the float chamber. The idle rpm, on a hose type flushette (have the hose on full force) is 1000 rpm for a 20" shaft engine, and 1200 rpm for a 25" shaft engine. In the water, the rpm will drop down to normal.

Beck · Dec 13, 2004

Re: '89 48spl low speed idle adj.

Thanks Joe Reeves, Just a clarification, the wound tension springs between the screws and carb, can the springs be seen without taking the screws all the way out? What I am talking about is a brass looking tube about an inch long on a slight angle toward the starboard side. It is located on top of the carb. and there is a small black fuel that feeds the opposite side perhaps for the choke. The brass jet that you speak of in paragraph eight in the top front area of the carb.(idle air bleed jet) and the brass fixed high speed jet located in the bottom center portion of the float. Both I assume are behind the front air duct cover. Thanks, Beck

Joe Reeves · Dec 13, 2004

Re: '89 48spl low speed idle adj.

I don't recall if the spring can be seen or not. Back one of those adjustable valves out and look at it. However, if you're not going to go through the adjuctment procedure I mentioned above, I'd suggest that you gently count the turns needed to seat that needle valve, then back it out. The jets are in the carburetor.

OBJ · Dec 13, 2004

Re: '89 48spl low speed idle adj.

The spring is visible Joe. What ya' really need Beck is a OEM service manual. Take all the guess work outta what ya' wanna' do.

Beck · Dec 15, 2004

Re: '89 48spl low speed idle adj.

Thanks Joe, OBJ, actually I do have a Seloc manual and in some of the pictures it shows the low speed idle to be on front upper center of the carb which you would have to access by removing front of the air silencer from the carbs. When I checked the carbs for stoppages I removed the air silencer both front and rear (which bolts to carbs) and removed the high speed fixed jet (bottom of carb) and also the slow speed which was right above them (top of carb). I notice (what I think is the slow speed jet) can be accessed thru the back part of the air box. Just removing the front of the air box you can then see the screw head of what I think is the slow speed jet. I do not see any external springs etc. This is why I am confused. Also the aprox. 1/4 dia brass pipe on the very top of the carb looks like it should be the idle air bleed jet as it is on the top. Thanks again, Beck Ps: Sorry for being so dense on this it's just that are two thinks that could be adjusted and I don't want to fool with the wrong thing. Where the best place to get a OEM service manual, here on the forumn or at a dealer which is about a mile from my home?

angus63 · Dec 15, 2004

Re: '89 48spl low speed idle adj.

www.theoutboardwizard.com

Silvertip · Dec 15, 2004

Re: '89 48spl low speed idle adj.

Beck, there are no adjustments on the front of the carb with or without the airbox installed. There are also no adjustments on the port side of the carb. Everything you need to adjust is on the starboard side. With the airbox off, looking at the front of the carb, the slotted screw you see is simply serving as a plug or on some engines it is an intermediate air bleed orfice (simply a small hole and its not adjustable). At the starboard side of the carb (near the top) is a slotted screw with a spring behind it (looks like the spring on a ball point pen refill). This is the IDLE MIXTURE screw. Adjust it as Joe said. The next adjustments are done in the sequence I've listed: 1. Diconnect throttle cable from throttle lever. 2. Throttle control rod dimension = 7-13/16" 3. Spark control rod dimension = 2-1/16" 4. Loosen cam follower on carb. 5. Adjust IDLE SPEED SCREW (its on the spark control lever & has a locknut on it)so spark roller is centered between marks. 6. Loosen upper carb throttle lever adjusment screw and snap the throttle to ensure the plate closes fully. 7. Rotate upper carb lever closed, and tighten the screw. 8. Operate the throttles to ensure valves open and close (fully) at precisely the same time. 9. Bring the throttle cam follower and cam follwer roller together so the roller is centered on the alignment mark and tighten the screw.(Make sure the clear plastic is still in place on the roller) 10. Push the IDLE SPEED screw against its stop. The throttle cam follower roller should have 0.010 inch clearance between it and the cam. Make the adjustment by shortening or lengthening the throttle control rod. 11. Open throttles wide open and ensure the roll pins on the throttle shafts (port side) adn perfectly vertical. If not adjust the wide open throttle stop screw as required. 12. Maximum timing is 18 - 20 degrees BTDC. Adjust spark control rod swivel (2-turns = 1 degree). Lengthening = more advance, shortening = less advance. See why a manual is necessary?

OBJ · Dec 15, 2004

Re: '89 48spl low speed idle adj.

Beck...check the links below for reprints of the OEM manual. You can also get parts manuals too. http://www.marineengine.com/manuals/evinrude/order_pre-1980.html Or http://ww3.kencook.com/evinrudejohnsonmanuals/

Beck · Dec 16, 2004

Re: '89 48spl low speed idle adj.

Thanks to all for the info. When It warms up a little I will be checking and adjusting. It's about 40 outside, not very cold for some of you guys but here it was 78 two day ago. Happy Holidays, Beck

Stumpknocker · Dec 19, 2004

Re: '89 48spl low speed idle adj.

Beck, I just got back home from a week of fishing up in the Panhandle. Let me know if you need anything or info from my manual. Seems you are in order based on the posts from Joe.

Beck · Dec 20, 2004

Re: '89 48spl low speed idle adj.

Thanks to all, Gil I think I have lots of info. now and I am inquiring about the oem manual from the Outboard Wizard. Has anyone bought anything from them? No risk involved I hope or no more than usual? Beck

Beck · Dec 21, 2004

Re: '89 48spl low speed idle adj.

Gil009, just want to say thanks for the reply. I want to thank everyone for their replys. Yes I have several things to check out, made copies of everything and will check and adjust as needed. I am also checking with outboard wizzard for oem manuals, parts and service. I am also looking for 16' x-wide welded flat to replace a riveted 14'. I plan to put my 48 spl on the 16' flat. Anyone selling or know of someone selling please e-mail. Dpb1972@aol.com Thanks, Beck

'89 48spl low speed idle adj.

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